Chainsaws

I'm thinking about purchasing a Husqvarna 450E 18" 50.2cc 2 Stroke Gas Powered Chain saw...But I'm concerned if it will perform well at approx: 8,500 feet up where I will use it the most...Anyone encountered problems with this saw, or could recommend Chainsaws in the $350.00 price range that will work well at this altitude..

thanks